Journal
PHYSICAL REVIEW B
Volume 79, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.052507
Keywords
doping profiles; fluorine; grain size; iron compounds; neodymium compounds; phonons; Raman spectra; superconducting materials; superconducting transition temperature; vibrational modes
Funding
- Global COE for Materials Research and Education
- World Premier International Research Center (WPI) Initiative,
- MEXT, Japan,
- CREST Japan Science Technology Agency
- Grants-in-Aid for Scientific Research [19204035] Funding Source: KAKEN
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Raman spectra of superconductor NdFeAsO1-xFx (x=0.0,0.1,0.2) compounds have been systematically investigated as functions of temperature and fluorine concentration. It was found that fluorine doping leads to structure disorder of insulator Nd-O layers and detectable downshift as well as increased temperature coefficients of the Fe-As vibrational modes. Additionally, low-temperature Raman measurements reveal that the in-plane phonon modes of the layered compound are unusually more sensitive to temperature change than those along the axis, and this anisotropic temperature dependence of phonon models is further enhanced by fluorine doping.
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